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Journal Articles The Astrophysical Journal Year : 2022

The Great Dimming of Betelgeuse: A Surface Mass Ejection and Its Consequences

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1
Andrea K. Dupree
  • Function : Author
Klaus G. Strassmeier
  • Function : Author
Thomas Calderwood
  • Function : Author
Thomas Granzer
  • Function : Author
Michael Weber
  • Function : Author
Kateryna Kravchenko
  • Function : Author
Lynn D. Matthews
  • Function : Author
James Tappin
  • Function : Author
William T. Thompson
  • Function : Author

Abstract

The bright supergiant, Betelgeuse (Alpha Orionis, HD 39801), underwent a historic optical dimming during 2020 January 27-February 13. Many imaging and spectroscopic observations across the electromagnetic spectrum were obtained prior to, during, and subsequent to this dimming event. These observations of Betelgeuse reveal that a substantial surface mass ejection (SME) occurred and moved out through the extended atmosphere of the supergiant. A photospheric shock occurred in 2019 January-March, progressed through the extended atmosphere of the star during the following 11 months and led to dust production in the atmosphere. Resulting from the substantial mass outflow, the stellar photosphere was left with lower temperatures and the chromosphere with a lower density. The mass ejected could represent a significant fraction of the total annual mass-loss rate from the star suggesting that episodic mass-loss events can contribute an amount comparable to that of the stellar wind. Following the SME, Betelgeuse was left with a cooler average photosphere, an unusual short photometric oscillation, reduced velocity excursions, and the disappearance of the ~400 day pulsation in the optical and radial velocity for more than two years following the Great Dimming.
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Dates and versions

insu-03874891 , version 1 (28-11-2022)

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Attribution - CC BY 4.0

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Andrea K. Dupree, Klaus G. Strassmeier, Thomas Calderwood, Thomas Granzer, Michael Weber, et al.. The Great Dimming of Betelgeuse: A Surface Mass Ejection and Its Consequences. The Astrophysical Journal, 2022, 936, ⟨10.3847/1538-4357/ac7853⟩. ⟨insu-03874891⟩
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